Question 1016511
Original swimming poole has surface area of (1/2)*10*12=60 m^2
It is reduced to 1/6 of that.  
(1/2)(10/x)(12/x)=10
(120/x^2)=20
x^2=6
x=sqrt(6)
it was reduced by1/ sqrt (6)
(1/2)*(5/3)sqrt(6)*2 sqrt(6)=10